The truck driver carries a special license, as the law 'requires' (him to do). = The truck driver carries a special license, 'as required by' law.
What will be 'required' of me if I accept the job? = What will I be 'required' to do if I accept the job?
The newspaper is 'required reading' [=reading that must be done] in my politics course.
(..) Why do I have to do any of this? He's the one who claimed he knew the language. Your line of work requires a specialized vocabulary. I got nervous. I forgot the words. Shoot me. You've had worse ideas lately. (..)1969 Butch Cassidy and the Sundance Kid